Insert chaser holder



Patente d Apr. 18, 1944 UNITED STATES PATENT OFFICE INSERT oHAsER HOLDER v I H Jesse A. Fluke, Argus, Pa. Application September 12, 1942, Serial No. 458,132

1 Claim. (01. 51-224) g The present invention relates to new and useful improvements in holders for insert chasers for internal and external threads particularly for grinding throats, and has for its primary object to provide, in a manner as hereinafter set forth, a device comprising a novel construction, combination and arrangement whereby substantially any desired adjustment of the tool or chaser may be expeditiously and accurately made.

Another very important object of the invention is to provide a holder of the aforementioned character which may be conveniently changed to accommodate different sizes of internal and external chasers.

Other objects of the invention are to provide an insert chaser holder of the character described which will be comparatively simple in construction, strong, durable, highly eflicient and reliable in use, compact, and which may be manufactured at low cost. I

All of the foregoing and still further objects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawings wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a View in side elevation of an insert chaser holder constructed in accordance with the present invention.

Figure 2 is a View in vertical longitudinal section through the device, taken substantially on the line 22 of Figure 3.

Figure 3 is a top plan view with an end portion broken away.

Figure 4 is a fragmentary view in cross section, taken substantially on the line 4-4 of Figure 1.

Figure 5 is a fragmentary View in bottom plan of the rotatably adjustable base.

Figure 6 is a top plan view of an end portion of the base.

Figure 7 is a view in vertical longitudinal section through the holder which accommodates chasers for internal threads.

Referring now to the drawings in detail, it will be seen that reference character l designates a stand of suitable metal. The stand I is to be firmly secured on any suitable grinder having Vertical as well as endwise motion. Secured for rotary adjustment on the stand 4 by a bolt 2 is an elongated metallic base 3. As illustrated to advantage in Figure 2 of the drawings,-the head of the bolt 2 is countersunk in the-upper portion of the base 3.

Theelongated base 3 has formed longitudinally therein a channel 4. The channel 4 extends from the forward end of the base 3 to a point in spaced relation to the rear end thereof. A longitudinal slot 5 in the base 3 communicates with the channel 4 at an, intermediate point.

Mounted for longitudinal sliding adjustment on the base 3 is a metallic carriage 6. The carriagetincludes, beneath its forward portion, a longitudinal tongueor rib l constituting a guide which is operable longitudinally in the channel 4.

Mounted beneath the rear end portion of the carriage B, which projects beyond the corresponding end of the base 3, is a bearing 8. An adjusting screw 9 is rotatably secured in the bearing 8. An operating head H1 is fixed on the rear end portion of the screw 9. The forward portion of the screw 9 is threadedly connected to the rear end portion of the base 3 for adjusting the carriage 6 longitudinally on said base. A bolt ll, operable in the slot 5, secures the carriage 6 in adjusted position.

Removably and adjustably mounted on the carriage i5 is a holder l2. The holder l2 includes a plate l3 which rests on the carriage 6. Rising from the plate It, at an intermediate point, is a pair of spaced, opposed flanges M. A pin l5 extends between the flanges [4.

A thumb screw It secures the rear end portion of the plate l3 to the carriage 6. Anchored in the forward end portion of the plate l3 and depending therefrom is a pin I! which is operable laterally in a groove l8 (see Fig. 4) which is provided therefor in the carriage 6. Adjusting screws l9 for the holder l2 are threaded transversely into the carriage 6 from the sides thereof, said screws projecting into the slot I8 and being engaged with diametrically opposite sides of the pin IT. This is also shown to advantage in Figure 4 of the drawings.

The flanges [4 receive therebetween a removable chaser 28 for external threads. The chaser 20 rests on the plate 13 with its rear end abutting the pin it, said chaser projecting forwardly beyond the flanges IQ for engagement with the work. A set screw 2| in one of the flanges l4 releasably secures the chaser 28 in position.

It is thought that the operation of the device will be readily apparent from a consideration of the foregoing. Briefly, with the base 3 in the desired position on the stand I, the holder [2 for the correct size of chaser 20 is mounted and secured in position on the carriage 6. The desired chaser 20 is then inserted and secured by the set screw 2|. The bolt H is then loosened to permit adjustment of the carriage 6 through the medium of the screw 9, after which said bolt is again tightened. An indicating mark 28 on the carriage 6 coacts with a scale 29 on the base 3 to facilitate adjusting said carriage as desired. Through the medium of the screws l9 which are engaged with the pin H, the holder I2 may be accurately adjusted on the thumb screw IE to change the position of the radius of the chaser 20 relative to the work as desired. An indicator 30 projects forwardly from the holder l2 and coacts with a scale 3| on the carriage 6 to facilitate adjusting said holder. The device permits the grinding of right and left hand external thread insert chasers.

In Figure 7 of the drawings, a holder for chasers for internal threads is designated generally by reference character 22. The holder 22 includes a metallic body 23 from one end of which an apertured tongue 24 projects. -Extending into the upper portion of the body 23 from the other or forward end thereof is a recess 25 for the reception of the chaser. A set screw 26 is provided for securing the chaser in position in the recess 25. Depending from the forward portion of the body 23 is a pin 21 which is operable in the groove l8 by the screws I9. An indicator 32 on the holder 22 coacts with the scale 3|. Both right and left hand internal thread insert chasers may be ground with the holder 22.

It is believed that the many advantages of an insert chaser holder constructed in accordance with the present invention will be readily understood, and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction and in theicombination and arrangement of parts maybe resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

An insert chaser holder comprising a stand, a base mounted for rotary adjustment on said stand, said base having aslot therein, a carriage slidably mounted on said base, a manually operable screw rotatably secured to the carriage and threadedly connected to the base for adjusting said carriage on said base, a bolt threadedly mounted on the carriage and operable in the slot for securing said carriage in adjusted position, a removable holder pivotally secured for swinging adjustment on the carriage, means for releasably securing an insert chaser in said holder, and means for pivotally adjusting the holder on the carriage, the last-named means including a pin anchored in the holder and depending therefrom, the carriage having a slot therein accommodating the pin, and screws threadedly mounted in the carriage-and engaged with the pin in the slot for swinging the holder.

JESSE A. FLUKE. 

